Stamp-mill.



PATE-'N 'I'BD JULY 24,1906.

- J. alc. A. HUNT.

STAMP MILL. APPLICATION lfILIm 00120, v1904'.

[nde/i NITI) STATES PATENT OFFICE.

JOHN. HUNT AND CHARLES A. HUNT, OF LOS ANGELES, CALIFORNIA.

STAMP-MILL.

Patented July 24, 1906.

To @ZZ whom it may concern:

Be it known that we, JOHN HUNT and CHARLES A. HUNT, citizens of theUnited States, residing at Los Angeles, in the county of Los Angeles andState of California, have invented new and useful Improvements inStamp-Mills, of which the following is a specification.

Our invention relates to stamp-mills in which a plurality of stamps areoperated by a single driving-shaft; and the objects thereof are toprovide a stamp-mill of compact form in which stamps are operated withsmall expenditure of power. We accomplish these objects by thestamp-mill described herein and illustrated in the accompanyingdrawings, in which- Figure 1 is a front elevation, with the front of oneof the mortar-boxes removed. Figs. 2 and 3 are sections taken on thelines 2 2- and 3 3 of Fig. 1 looking in the direction of the arrows.Figs. 4 and 5 are details of construction of the ball-race of tappet andthe stamp lifter or cam.

In the drawings7 6 is the frame, in which is mounted the verticalcam-Wheel-operating shaft 7, upon which is mounted cam-wheel 8, having aplurality of wedge-shaped cams 9 secured to its upper surface. Bevelgear-wheel 10 is also secured upon this shaft and meshes with bevel-gear1 1 which last ge ar-wheel is secured upon shaft 12 to the outer end ofwhich is secured pulley 13, to which power is applied when it is desiredto operate the cam-wheel. In the bottom of the frame are mounted aplurality of mortars 14 of usual construction.

tamps 15, having stems 16, are provided for crushing the ore in thesemortars. Up on these stamp-stems are tappets 17, in the bottom of whichand near the outer edge thereof is provided a groove 18, which forms thetop of a ball-race, in which are carried balls 19. These balls aresecured to the tappet by a plate 20, having holes therein, through whichthe balls project, as shown in Fig. 4. The tappets on these stemsproject over the edge on the cam-wheel and are adapted to be engaged bythe cams thereon and lifted thereby to secure the necessary drop of thestamp required for crushing the ore. In the drawings we have shown ourmill as provided with four mortars and four stamps, as we consider thata very convenient number; but

more or less mortars and stamps maybe used, as desired. Where fourstamps are used, we prefer to have our cam-wheel provided with five camsequall spaced apart, so that upon the revolution o the cam-wheel onlythe full lift of one stamp and the partial lift of another stamp will beobtained at any one time, as by this arrangement this number of stampscan be more successfully and economically operated than in any otherarrangement that we know of. Intermediate the tappet and the stamp thestems are guided by guides 21, which are secured to cross-timbers 22,and the upper end of the stamp-stems are guided by passing through thetop timbers 23 of the frame.

In the operation of our mill power is applied to drive the cam-wheel inthe direction indicated by the arrow in Fig. 3, thereby bringing the lowend of the wedge-shaped cam 'under the tappet and gradually lifting thesame until the tappet drops off the cam, when the stamp falls upon theore in the mortar. The ball-bearing in the bottom of the tappet reducesthe friction between the cams and tappet, so that less power is requiredto raise the stamps than if the ball-bearing was not provided. Therotarymovement of the cam produces a rotary movement of the stamp, sothat the face of the stamp and the die in the mortar wear evenly.

Having described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

1. In a stamp-mill a horizontally-revoluble cam-wheel wedge-shaped camsupon the upper surface thereof; a vertically-movable stamp having stemsprojecting upwardly therefrom and passing in close proximity to theperiphery o the cam-wheel; tappets rigidly secured to said stems abovesaid camwheel and adapted to be engaged and lifted and revolved anddropped by the cams on the cam-wheel, said tappets having a ball-race inthe bottom of each; and balls in said ballrace.

"2. In a stamp-mill a frame; a plurality of mortars having the centersthereof arranged in a circle secured in the bottom thereof; avertically-movable stamp for each of said mortars; vertically-projectingstems for said stamps; guides for said stems, said guides being securedto said frame; tappets having IOO ball-races in the bottom thereofrigidly se- In Witness that We elarn the foregonglwe xo cured to saidstems; a horzontally-revoluble have hereunto subscribed our names this13th earn-Wheel having the outer perimeter n day of' October, 1904.close proxjlnty to said stems; Wedge-shaped JOHN HUNT. earns upon theupper surface of sald earn- E Wheel adapted to engage the tappets on theCHARLES A' HUNT' stamp-stems and thereby lift revolve and Witnesses:drop the same; means to operate said earn- G. E. HARPHAM,

Wheel. V l MYRTLE JONES.

